JPS58141309A - Hot repairing method of lining of blast furnace - Google Patents

Abstract

PURPOSE:To repair the damaged parts of the linings of a blast furnace precisely with less material losses by fixing the refractory blocks suspended from the hole parts at the furnace top by means of the supporting metals inserted into the through-holes provided in said damaged parts and spraying refractories into the spacings between the blocks. CONSTITUTION:The level of charging materials 2 in a blast furnace 1 are lowered to about 1-2 below the damaged parts 3 of the furnace wall and the accurate positions of the exposed parts 3 are observed. A required number of through-holes 4 are provided from the outside of the furnace in the parts 3. Block supporting metals 5 of which the preceding ends are bent like hooks are beforehand inserted through the holes 4. Castable refractory blocks 9 provided with hook fittings 10 and anchors are 11 are hoisted with a crane or the like 7 and wire ropes 8 and are put into the furnace through a hole part 6 such as armor hole, manhole or the like of the furnace top. The blocks are brought near the positions 3 and the metals 5 are hooked to the fittings 10. The blocks 9 are brought near the positions 3 and the metals 5 are fixed. Castable refractories 19 are sprayed and applied into the spacings between the blocks 9 through a pipe 16 inserted through the hole 6.

Description

[Detailed description of the invention] Regarding how to repair.

Conventionally, the spraying method used as a hot repair method for blast furnace linings causes the coarse particles of the sprayed material to regenerate, and the total loss reaches as much as 20%.

In addition, with the press-fitting method, it is difficult to determine the exact location of the damaged area, and the press-fitting hole often deviates from the opening position, resulting in the intended repair or complete failure. Furthermore, the conventional spraying method and press-in method were used to construct the refractories, but last year it was difficult to install anchors of the appropriate shape to support the shaped refractories, and the construction was difficult. Indeterminate.
The support of shaped refractories is not sufficient, resulting in poor durability.

The present invention #i solves these drawbacks, and as detailed below, the blast furnace is operated on a reduced scale to accurately know the damage situation and position of the blast furnace lining in the hot state, and to accurately detect the damage with less loss. The main purpose is to provide a method for repair.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the contents 2 in the blast furnace 1 are reduced in scale by 1 to 2 mlfC below the damaged part 6 of the furnace wall, and are lowered at a stroke speed of about 1.2 m/hr. The limit is from an infinitesimal distance. Ninth, this temperature rise at the top of the furnace during shearing is suppressed by water sprinkling at the furnace mouth and charging water. Observe the exact location of the damaged area 3 on the rattan furnace wall, make several holes 4 that penetrate from the outside of the furnace wall at the damaged area 3 to the inside of the furnace, and bend the tip of each opening 4 into a hook shape. Insert the block support hardware 5 into the furnace, and suspend it with wire 8 using a crane, hoist, and winch 7 through an opening 6 such as a hole or a manhole at the top of the blast furnace 1. Also, as shown in Figure 2, the 7-force-11 refractory is insufficient! Place the lock 9 into the furnace, bring it close to the damaged area B, and attach the block support hardware 5 to the latch AIG of the block 9.
After hooking the hook and pulling the block 9 to the damaged area 6, a nut 11# is screwed into the threaded part 12 of the block support hardware 5 and fixed to the iron skin 14. The block support hardware 5 is
For every 9 blocks, use at least two upper and lower lines (three for stability). MafcrJa foramen 4/Ii cul-de-sac 1
5 is bolted and attached by welding to prevent gas leakage in the blast furnace 1. These operations are repeated in the circumferential direction of the blast furnace. 7-hole, manhole above damaged location 6
Although the block 90 cannot be carried in only around the opening 6, it is possible to carry in the block 9 through other openings and position it in the damaged area for construction. To connect the Norikku 9 and the block 9, a large-sized refractory 16 is inserted into the furnace through the opening 6 of the armor hole, manhole, etc. at the top of the blast furnace 1, and a monolithic refractory 19 is sprayed. will be constructed. The monolithic refractory used was a clay castable refractory (chemical composition: klz0359-excellent, 810247-extreme). In addition,
17 is a working floor, and 18 is a pulley. Furthermore, the block 9
shows one example, and it is obvious to those skilled in the art that the design and arrangement of the hooking fitting 10 and the anchor 11 can be modified as desired.

When the damaged part 6 of the hole inside the blast furnace 1 is repaired using this construction method, as shown in Fig. 3, the hole 4 can be made accurately from outside the furnace at the damaged part B, and the anchor 1 of an appropriate shape can be made.
17! The block 9 with the attached block 1 is properly fixed at the damaged location B by the block support hardware 5! dK can be closely related. Therefore, the monolithic refractory material 19 that is sprayed between the nine a-locks 9 and the f-locks 9 is firmly held by the anchors 11 of the blocks 9, so that it has good durability. Furthermore, by using Flock 9 installation in combination with all spraying, the reno green loss rate relative to the total amount of construction was able to be reduced.

As described above, according to the present invention, it is possible to reliably repair the damaged parts of the blast furnace PJ tensioning in a hot manner, and the life of the blast furnace can be greatly extended.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view illustrating the repair method according to the present invention, FIG. 2 is a perspective view showing an example of a block used in the repair method of the present invention, and FIG. 3 is a view taken along the arrow OA in FIG. 1 after the repair is completed. In the figure, 21...Blast furnace, 2...Furnace contents, 6...Damaged area, 4...Open hole, 5...Block support hardware,
6... Armor hole, manhole, etc. C) Ii hole, 7...
・Crane, hoist, winch, etc., 8.--Wire, 9.-Unshaped refractory block, 1o.-
Hooks are metal fittings, 11... Anchors, 16... Refractory spraying is pipes, 19... Monolithic refractories. /

Claims (1)

[Claims] A required number of holes penetrating from the outside of the furnace to the inside of the furnace are made in the damaged part of the blast furnace lining, and the diblock support hardware for these holes is inserted into the furnace, and holes such as armor holes, manholes, etc. at the top of the blast furnace are inserted. Using a hole holder, crane, hoist, winch, etc., a monolithic refractory block is suspended in the furnace with a wire, hooked with block support hardware, and pulled to the damaged area and fixed.
A blast furnace lining hot repair method characterized by spraying monolithic refractories into gaps between monolithic refractory blocks.